Small signal amplifier for underground engineering parameter test
A technology of engineering parameters and amplifiers, applied in measurement, wellbore/well parts, earthwork drilling and production, etc., can solve the problems of difficult detection and easy to be submerged in noise, etc., to eliminate noise interference, obvious use effect and reasonable design Effect
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[0028] Such as figure 1 As shown, the small-signal amplifier for the downhole engineering parameter test includes a voltage source, a preamplifier, a low-pass filter, a high-pass filter, a notch filter, a post-amplification circuit and an A / D converter connected in sequence.
[0029] The voltage source is connected with the preamplifier through a bridge circuit. The size of the voltage source is determined by the downhole engineering conditions, generally 0 ~ 100μV.
[0030] The preamplifier is a fixed gain amplifier or a programmable gain amplifier.
[0031] The post-amplification circuit is an amplifier with adjustable gain.
[0032] Each module of the present invention is described in detail below.
[0033] 1. Preamplifier
[0034] Since the signal voltage output from the downhole sensor is a μV level signal. It may even be overwhelmed by noise and cannot be converted directly. The signal-to-noise ratio must be improved through a preamplifier to improve signal performa...
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